This happens sometimes and no company is immune. Someone on Steam just pushed a button just a little too early for Streets of Rage 4 content. It resulted in revealing some upcoming DLC. If you don’t like to be spoiled you can click away; I won’t blame you.
If you are still here, it’s time for the spoilers! According to the Steamdb.info page, Streets of Rage 4 – Mr. X Nightmare was posted on March 23rd. At the end of Streets of Rage 3. Mr. X died, so everyone is now interested in the way he returns for the DLC, or even if he’s in his original form. Even though the DLC is on the servers, the release date and pricing is currently unknown.
As of the writing of this article Dotemy, Lizardcube, and Guard Crush Games have not responded to this un-official announcement.